Faulty Samsung LE26R87BD, is it repairable ?

[Mikeyboy2007]

ok so i got another TV today that was nearly on its way to the dump... the problem is whats in the video, tv when switched on makes a crackling noise from speaker i assume, sometime doesnt come on when coming out of standby but when it does the picture is all messed up > have attached a video to show the best i can will upload some pictures of the boards also but there doesnt seem to be any bad caps

http://www.youtube.com/watch?v=aKixo...ature=youtu.be

[tom66]

Re: Faulty Samsung LE26R87BD, is it repairable ?

I would first check if the power supply rails are good.

[Mikeyboy2007]

Re: Faulty Samsung LE26R87BD, is it repairable ?

how would i go about doing that Tom66 ? Noob at this kinda stuff

[tom66]

Re: Faulty Samsung LE26R87BD, is it repairable ?

Check each voltage on each pin and compare to the labels.
Red probe on each pin, black on case.

[Mikeyboy2007]

Re: Faulty Samsung LE26R87BD, is it repairable ?

ok mate will check back with results

[Mikeyboy2007]

Re: Faulty Samsung LE26R87BD, is it repairable ?

what voltage will i set multimeter to ?

[tom66]

Re: Faulty Samsung LE26R87BD, is it repairable ?

20VDC or if it goes to "1", 200VDC.

[Mikeyboy2007]

Re: Faulty Samsung LE26R87BD, is it repairable ?

am i doing this with the cables plugged in and tv powered on as the readings are dropping as the tv keeps going back into standby then rebooting

[tom66]

Re: Faulty Samsung LE26R87BD, is it repairable ?

Measure while the TV is running, if it stops, pause measuring then resume when it starts "working" again.

[Mikeyboy2007]

Re: Faulty Samsung LE26R87BD, is it repairable ?

ok will give it a pop and update you.. may be a while as tv is switching on and off by itself lol

[anotherdude]

Re: Faulty Samsung LE26R87BD, is it repairable ?

seems similar to the samsung i'm having problems with, get the crackle from the speaker the reboots and the distorted video

i found it's a problem with the av board, if i gave it some heat with a hair dryer towards the top it'd clear up pretty quick, maybe not be the same here but there both the same model LE32R87BDX just mines the 32"

[Mikeyboy2007]

Re: Faulty Samsung LE26R87BD, is it repairable ?

Tom66 just to update you, i was half way through doing the pins there and tv has stayed on for a few minutes and turned it round and was faced with a picture on the screen, fuzzy though i have attached a picture if it helps but will post results of pins as soon as im done

[Mikeyboy2007]

Re: Faulty Samsung LE26R87BD, is it repairable ?

seems similar to the samsung i'm having problems with, get the crackle from the speaker the reboots and the distorted video

i found it's a problem with the av board, if i gave it some heat with a hair dryer towards the top it'd clear up pretty quick, maybe not be the same here but there both the same model LE32R87BDX just mines the 32"

yeah mate mines has a crackling coming from the speakers too and when it was booting i was getting distorted video

[Mikeyboy2007]

Re: Faulty Samsung LE26R87BD, is it repairable ?

ok there are 2 leads going to mainboard, after i posted that picture and finished the pins the picture has got clear and the AV board is realy warm at the top but picture isnt fuzzing anymore... so think its down to AV board Tom66 ?? is it repairable or will i need to buy new board altogether

Mainboard lead 1

1 on/off 5.03V
2 A/D 0.21V
3 P/D 5.70V
4 GND 0.00V
5 24V DET 5.40V

Mainboard Lead 2 (24 pin)

1 on/off 3.38v
2 n/c 0v
3 st-by 5.21
4 s-gnd 0v
5 gnd 0v
6 gnd 0v
7 12v 12.17v
8 12v 12.17v
9 gnd 0v
10 gnd 0v
11 gnd 0v
12 gnd 0v
13 5.3v 5.29v
14 5.3v 5.29v
15 5.3v 5.29v
16 5.3v 5.29v
17 gnd 0v
18 gnd 0v
19 13v 12.81v
20 gnd 0v
21 13v 12.81v
22 13v 12.81v
23 N/C 0v
24 N/C 0v

[anotherdude]

Re: Faulty Samsung LE26R87BD, is it repairable ?

Tom66 just to update you, i was half way through doing the pins there and tv has stayed on for a few minutes and turned it round and was faced with a picture on the screen, fuzzy though i have attached a picture if it helps but will post results of pins as soon as im done

exactly the same as min, if you change the input the fuzzy text fixes itself

found no solution for mine as of yet

[tom66]

Re: Faulty Samsung LE26R87BD, is it repairable ?

The rails appear OK.
I would switch off the TV and cool it down.
Then heat up parts of the main board -- hairdryer and cardboard tube is one option.
When you find heating a part improves it, turn the set off, and repeat the test.

[Mikeyboy2007]

Re: Faulty Samsung LE26R87BD, is it repairable ?

ive done that a few times now and same results every time... is there a way to repair the board or would i have to purchase a new one

[anotherdude]

Re: Faulty Samsung LE26R87BD, is it repairable ?

ive done that a few times now and same results every time... is there a way to repair the board or would i have to purchase a new one

from what i can gather it's needs a reball on one of the bga chips, pretty sure it's the top one

reball can be expensive but so can a new board

[Mikeyboy2007]

Re: Faulty Samsung LE26R87BD, is it repairable ?

my mate has a reballer.. will have a word with him see if hes up to the challenge

[tom66]

Re: Faulty Samsung LE26R87BD, is it repairable ?

No good without the reball mask I thought? Different for each chip and unlikely to be available for a Samsung LCD TV board. Lots available for Xbox etc!